diff --git a/README.md b/README.md
index dcd1091..a6c3254 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Note: projections tagged \[d3-geo\] are exported by [d3-geo](https://github.com/
Airy’s minimum-error azimuthal projection.
-# airy.radius([radius])
+# airy.radius([radius])
Defaults to 90°.
@@ -435,7 +435,7 @@ If *lobes* is specified, sets the number of lobes (the parameter *H* in the lite
Hill eucyclic projection is pseudoconic and equal-area.
-# hill.ratio([ratio])
+# hill.ratio([ratio])
Defaults to 1. With a ratio of 0, this projection becomes the [Maurer No. 73](https://observablehq.com/@d3/hill-eucyclic?b=0). As it approaches ∞, the projection converges to the [Eckert IV](#geoEckert4).
@@ -918,9 +918,9 @@ Steve Waterman’s butterfly projection.
Defines a new quincuncial projection for the specified [raw projection](#raw-projections) function *project*. The default rotation is [-90°, -90°, 45°] and the default clip angle is 180° - ε.
-# d3.geoGringortenQuincuncial() · [Source](https://github.com/d3/d3-geo-projection/blob/main/src/quincuncial/gringorten.js)
+# d3.geoGringortenQuincuncial() · [Source](https://github.com/d3/d3-geo-projection/blob/main/src/quincuncial/gringorten.js), [Examples](https://observablehq.com/@d3/gringorten-quincuncial)
-
+[
](https://observablehq.com/@d3/gringorten-quincuncial)
The Gringorten square equal-area projection.